Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ef654544149f8d3…

MALICIOUS

PDF

89.5 KB Created: 2021-09-12 21:49:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0b6a8cb4f0ee37bddf6d0cafc05a4ea4 SHA-1: a2da45f5fb77594c7c827acc42fd5312add937db SHA-256: 8ef654544149f8d3453fa7354e16bcefa729f3ba90f53af5a7948113d91505ce
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm with numerous external URIs, many hosted on potentially disposable domains. While no scripts were explicitly extracted, the PDF structure and the presence of external links suggest an attempt to redirect users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://gibkrakow.pl/uploads/files/pubogofijofob.pdf In PDF document text
    • http://tznjl.com/userfiles/files/91700866021.pdfIn PDF document text
    • http://formpart.com/upload/ckfinder/files/62496713992.pdfIn PDF document text
    • http://preiss.at/upload_files/files/pibawuxakofikufij.pdfIn PDF document text
    • http://birnagarcollege.in/userfiles/file/pewofivifalododudozatu.pdfIn PDF document text
    • http://cx-gl.hu/images/files/nufijasaxalawa.pdfIn PDF document text
    • http://mtecommerce.it/public/news/file/2063204690.pdfIn PDF document text
    • http://lidaoxc.com/upload/files/75759179948.pdfIn PDF document text
    • http://nieruchomosciklodzko.pl/files/file/kejezajob.pdfIn PDF document text
    • http://aotwresort.info/ckfinder/userfiles/files/saxuta.pdfIn PDF document text
    • http://xn--oy2b19v1mb1yi.com/userfiles/file/zimowizilebamakegedizuku.pdfIn PDF document text
    • https://inprovitargentina.com/ckfinder/userfiles/files/dixovis.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139fee9c7a68---posaduvarex.pdfIn PDF document text
    • http://playonathletics.com/userfiles/file/lafolemebikodewadogusetex.pdfIn PDF document text
    • https://regiefranchet.fr/userfiles/files/witewexokirinalonedosow.pdfIn PDF document text
    • http://tuderprogettazione.it/userfiles/files/dedebexosamojisavitufixes.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16130ac91eed3f---89124293276.pdfIn PDF document text
    • http://songhakbbq.com/uploads/files/lamavogasal.pdfIn PDF document text
    • http://glassick.com/userfiles/file/35629618238.pdfIn PDF document text
    • https://atcotourismtravel.com/userfiles/file/wulasulaf.pdfIn PDF document text
    • http://infoegrafica.com/userfiles/files/givewutidoliwisajak.pdfIn PDF document text
    • http://daindnc.com/fckeditor/userfiles/file/makavogoseb.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=android+messages+no+soundPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f8a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8A1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000110b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110B3 18640 bytes
SHA-256: 2b1a0a77774efe82d0cc67278fb4de1452031a2466fbaa95efb01fc5decc72f8
font_02_sfnt_off000140bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140BF 10528 bytes
SHA-256: 55cf68a03932896f2f64154ec7a164b35549db4c163476295058c1a35403dd2b

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